133056891 has 16 divisors (see below), whose sum is σ = 215041920. Its totient is φ = 80640360.

The previous prime is 133056883. The next prime is 133056893. The reversal of 133056891 is 198650331.

It is a happy number.

133056891 is a `hidden beast` number, since 1 + 3 + 3 + 0 + 568 + 91 = 666.

It is not a de Polignac number, because 133056891 - 2³ = 133056883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133056893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223705 + ... + 224298.

It is an arithmetic number, because the mean of its divisors is an integer number (13440120).

Almost surely, 2^133056891 is an apocalyptic number.

133056891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

133056891 is a deficient number, since it is larger than the sum of its proper divisors (81985029).

133056891 is a wasteful number, since it uses less digits than its factorization.

133056891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448023 (or 448017 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 133056891 is about 11535.0288686245. The cubic root of 133056891 is about 510.5196433615.

The spelling of 133056891 in words is "one hundred thirty-three million, fifty-six thousand, eight hundred ninety-one".